A new method for determining the fracture toughness of main pipeline steels

Abstract

One of the fundamental aims of fracture mechanics is to define fracture toughness K-IC of a material. Hence, the ASTM E399 standard was developed. However according to the standard, large-sized specimens are required to determine the fracture toughness of low alloy carbon steels. ASTM E1921 standard was developed on the fracture toughness of ferritic steels. In this study, a new method was proposed to determine the fracture toughness of ferritic steels. The purpose of the present paper is to compare the results of the method with the experimental results. Two steels that are used in gas and oil main pipelines were investigated in this study.